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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Multiflame Patterns in Swirl-Driven Partially Premixed Natural Gas Combustion

[+] Author and Article Information
K. P. Vanoverberghe, E. V. Van den Bulck

Department of Mechanical Engineering, Applied Mechanics and Energy Section, Katholieke Universiteit Leuven, Celestijnenlaan 300A, 3001 Heverlee, Belgium

M. J. Tummers, W. A. Hübner

Department of Applied Physics, Thermal and Fluid Sciences Section, Technische Universiteit Delft, Lorentzweg 1, 2628CJ Delft, The Netherlands

J. Eng. Gas Turbines Power 125(1), 40-45 (Dec 27, 2002) (6 pages) doi:10.1115/1.1520159 History: Received August 01, 2001; Revised July 01, 2002; Online December 27, 2002
Copyright © 2003 by ASME
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References

Figures

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(left). Experimental 30 kW IFRF burner. Overview, including swirl generator, fuel rod, annular channel and burner quarl with 20 deg opening angle. (right). Characteristic dimensions of the experimental IFRF burner. For 30 kW, D0=27 mm.
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Schematic drawing of the octagonal quartz glass confinement with the burner installed in the bottom. Dimensions are in millimeter. (left). Side view including H-R axes. (right). Top view including X-R axes.
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Schematic drawing of five flame states. Nozzle stabilized flame (NSF); swirl stabilized flame (SSF); Coanda stabilized flame (CSF); pinched jet flame (PJF); backwall stabilized flame (BSF).
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Flame state transition pathways for various degree of premix ratios. The stoichiometric air to fuel ratio (A/F) equals 1.1. The numbers on the plot denote NOx emissions in mg/Nm3 based upon 3% O2 dry flue gas. (Conversion for NOx:1 mg/Nm3=0.4872 ppm). (left). DPX=0.0; (middle). DPX=0.7; (right). DPX=1.0.
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(left). Flame composition, isotherms and axial velocity contourlines of the SSF. UHC 3 5000 ppm; dashed line=CO 5000 ppm, 800, and 1300°C isotherms. Dotted line=−5, 0, 5, and 10 m/s axial velocity. (right). SSF mean velocities in the near-burner region, maximum velocity of 31 m/s recorded near the burner rim, reverse flow velocity equals −5 m/s along the burner centerline.
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(left). Flame composition, isotherms and axial velocity contourlines of the CSF. UHC3 5000 ppm; dashed line=CO 5000 ppm, 800 and 1600°C isotherms. Dotted line=−4, 0, and 3 m/s axial velocity. (right). CSF mean velocities in the near-burner region, maximum velocity of 24 m/s recorded near the burner rim, reverse flow velocity equals −7 m/s along the burner centerline.

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